Stihl MS 391 Safety Manual
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Stihl MS 391 Safety Manual

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Chain Saw Safety Manual

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  • Page 1 Chain Saw Safety Manual...
  • Page 3 This manual contains references to various chapters in the model-specific instruction manuals. You should therefore always refer to the instruction manual of your particular saw model. Please contact your STIHL dealer if you any questions after reading this manual. Chain Saw Safety Manual...
  • Page 4 STIHL for this machine or faster than with an axe which are technically equivalent. and a hand saw, because The machine should only be provided or Contact a dealer if in doubt.
  • Page 5 – Master control/stop switch must well ventilated place. Clean the machine move easily to STOP or 0 STIHL can supply a comprehensive immediately if fuel is spilled. Change range of protective clothing and – Check that the spark plug boot is your clothes immediately if they are equipment.
  • Page 6 Instruction Manual. not in perfect working order. Consult a Your power tool produces STIHL dealer if in doubt. toxic exhaust fumes as Do not start the chain saw if the chain is soon as the engine is in a cut.
  • Page 7 English Quickstop chain brake: – Always cut with a correctly sharpened, properly tensioned saw This device reduces the risk of injury in chain - the depth gauge setting certain situations - it cannot prevent must not be too large. kickback. When activated, the chain brake stops the saw chain within a –...
  • Page 8 English – Do not allow the top of the guide bar Holding and guiding the machine to become jammed – Do not twist the guide bar in the cut Be very careful – with freely hanging limbs – with trunks that are under tension between other trees because they fell unfavorably Make certain that all parts of your body...
  • Page 9 English At the end of the cut, the chain saw is no – the natural inclination of the tree longer supported by the cutting – unusually heavy limb structure, attachment in the cut. The machine's asymmetrical growth, damage to weight must be borne by the user – risk tree of loss of control! –...
  • Page 10 Clear the work area at the trunk of when it comes to the sequence of branches, brush and other horizontal and diagonal cuts – observe STIHL recommends the following obstacles – secure footing for all national regulations with regard to felling procedure: workers technique.
  • Page 11 English Sapwood cuts Felling cut The bridge (E) functions as a hinge to guide the tree to the ground. With long-fibered wood, sapwood cuts Give a warning cry of "timber!" before prevent the sapwood from splintering making the felling cut. –...
  • Page 12 English Thin trunks: simple fan cut Large diameter trunks: sectioning method 2. While repositioning for the next cut, keep the guide bar fully engaged in Engage the spiked bumper behind the cut in order to avoid an uneven the hinge. Pivot the chain saw Use the sectioning method if the felling cut - apply the spiked bumper around this point –...
  • Page 13 English – with trees that are difficult to fell Sawing thin wood (oak, beech), to make possible to maintain the planned direction of fall – Use a sturdy, stable fixture – more precisely and prevent the sawhorse heartwood from splintering –...
  • Page 14 English If the bucking cut is made from the No general recommendation can be STIHL recommends the use of genuine bottom upwards (underbuck) – risk of given for the length of usage because it STIHL spare parts. Such parts have pushback! depends on several factors.
  • Page 15 English Switch off engine – to check the chain tension – to retension the chain – to change chains – for remedying malfunctions Observe sharpening instructions – for safe and proper handling, always keep the chain and guide bar in flawless condition.

  • Page 16: Maintenance And Care

    English Maintenance and Care The following maintenance intervals apply for normal operating conditions only. If your daily working time is longer or operating conditions are difficult (very dusty work area, resin-rich wood, tropical wood, etc.), shorten the specified intervals accordingly. If you only use the saw occasionally, extend the intervals accordingly.
  • Page 17 Clean, replace if necessary Check Chain catcher Replace Safety labels Replace STIHL recommends a STIHL servicing dealer. Firmly tighten down the cylinder base screws of professional saws (3.4 kW or more) after 10 to 20 hours of operation. Chain Saw Safety Manual...

  • Page 18: Main Parts

    English Main Parts Shroud lock Carburetor adjusting screws Fuel pump (easy start Shutter (summer / winter operation, MS 211 only) Chain brake Chain sprocket Chain sprocket cover Chain catcher Chain tensioner (side) 10 Bumper spike 11 Guide bar 12 Oilmatic saw chain 13 Adjusting wheel (quick chain tensioner) 14 Handle of wingnut...
  • Page 20 0457-184-0121 englisch www.stihl.com *04571840121* 0457-184-0121...
  • Page 21 STIHL MS 311, 391 Instruction Manual...

  • Page 23: Table Of Contents

    Spark Arresting Screen in Muffler Spark Plug Replacing the Starter Rope and Rewind Spring Storing the Machine Checking and Replacing the Chain Sprocket Maintaining and Sharpening the Saw Chain Maintenance and Care Minimize Wear and Avoid Damage MS 311, MS 391...

  • Page 24: Guide To Using This Manual

    Have your dealer or other Engineering improvements experienced user show you how to operate your power tool or attend a STIHL's philosophy is to continually special course in its operation. Ematic; chain oil flow improve all of its products. For this...
  • Page 25 STIHL recommends the use of STIHL The use of noise emitting power tools original tools, guide bars, chains, chain may be restricted to certain times by sprockets and accessories.
  • Page 26 Place the unit on firm ground in an open Make sure you always have good area. Make sure you have good balance balance and secure footing. and secure footing. Hold the unit securely. The cutting attachment must MS 311, MS 391...
  • Page 27 – Shut off the engine and wait until the The most common reactive forces that chain comes to a complete stanstill. occur during cutting are: kickback, pushback and pull-in. – Check condition – Check sharpness. MS 311, MS 391...
  • Page 28 Be aware of the location of the guide tree or limb. bar nose at all times. – Do not cut with the bar nose. – Take special care with small, tough limbs, they may catch the chain. MS 311, MS 391...
  • Page 29 Do not work above shoulder height Do not underbuck freely hanging limbs. extent of the dangers is complicated, if – Never operate your unit with one not impossible. Use aids such as a cable hand winch or tractor in such cases. MS 311, MS 391...
  • Page 30 Remove large buttress roots: Make the vertical cut first, then the horizontal – but only if the wood is Maintain a distance of at least 2 1/2 tree Direction of fall sound lengths from the next felling site. MS 311, MS 391...
  • Page 31 Important: – Felling notch at a right angle to the planned direction of fall. – As close to the ground as possible. – Cut to a depth of about 1/5 to 1/3 of the trunk diameter. MS 311, MS 391...
  • Page 32 This is the hinge. Drive wedges into the felling cut in good time. Use only wooden, aluminum or plastic wedges. Never steel, which can damage the chain and cause kickback. MS 311, MS 391...
  • Page 33 If tree diameter is more than twice – For relieving cuts during bucking the length of the guide bar. – For DIY projects – If a large portion of heartwood remains uncut on large diameter trees. MS 311, MS 391...
  • Page 34 – take extra – Never cut several limbs at once. care since there is an increased danger of kickback. Make relieving cut at the compression side (1) Make bucking cut at the tension side (2) MS 311, MS 391...
  • Page 35 Use only a spark plug of the type fuel vapour – health risk. approved by STIHL and make sure it is Service the machine regularly. Do not To reduce the risk of injury, shut off the in good condition –...

  • Page 36: Cutting Attachment

    English Disengaging the chain brake. Cutting Attachment Mounting the Bar and Chain STIHL is the only manufacturer in the Removing the chain sprocket cover industry to produce its own chain saws, guide bars, saw chains and chain sprockets. A cutting attachment consists of the saw chain, guide bar and chain sprocket.

  • Page 37: Tensioning The Chain

    A new chain has to be retensioned more see chapter on "Operating Saw Chain" often than one that has been in use for Instructions". some time. Check chain tension frequently – see chapter on "Operating Instructions". MS 311, MS 391...

  • Page 38: Fuel

    STIHL MotoMix Fuel mix ages – only mix sufficient fuel If STIHL two-stroke engine oil is not for a few weeks work. Do not store fuel available, use only quality two-stroke oil mix for longer than 3 months. Exposure STIHL recommends the use of STIHL designed for use in air-cooled engines.

  • Page 39: Fueling

    Take care not to spill fuel while fueling Opening and do not overfill the tank. Hold the cap down and twist it STIHL recommends use of the STIHL clockwise until it engages filling system for fuel (special accessory). Refueling...

  • Page 40: Chain Lubricant

    Left: Base of cap tilted Biological chain oil must be Right: Base of cap correctly resistant to aging (e.g. STIHL positioned Bioplus) since it will otherwise – The lug on the clip must engage quickly turn to resin. This results...

  • Page 41: Filling Chain Oil Tank

    Every new chain has to be broken in for about 2 to 3 minutes. STIHL recommends you use the STIHL filler nozzle for chain oil (special After breaking in the chain, check chain accessory).

  • Page 42: Chain Brake

    STIHL recommends that you have servicing and repair work carried Pull the hand guard back toward the out exclusively by an authorized STIHL front handle, servicing dealer. Maintain the following servicing intervals: Always disengage chain brake...

  • Page 43: Winter Operation

    In case of erratic idling behavior or poor (arrows) and fasten with the acceleration screws (2) Turn the low speed screw (L) 1/4 turn counterclockwise Pull the slide (1) out of the position s (summer operation) MS 311, MS 391...

  • Page 44: Starting / Stopping The Engine

    Place your right foot through the minute) starting the cold engine rear handle – when the engine has turned over for the first time – after ventilation of the combustion chamber, if the engine was flooded MS 311, MS 391...
  • Page 45 Starting the chain saw the saw chain is blocked Simultaneously press the throttle There must not be anyone within trigger lockout (2) and throttle the swivel range of the chain saw. trigger (3) – set master control lever (4) MS 311, MS 391...
  • Page 46 (saw chain is stationary) chamber will quickly damage the clutch and chain brake. Replace the spark plug – see "Spark plug" Set the Master Control lever to starting acceleration n – even if the engine is cold MS 311, MS 391...

  • Page 47: Operating Instructions

    Always slacken off the chain again in use already for an extended period. after finishing work. The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings. MS 311, MS 391...

  • Page 48: Oil Quantity Control

    The chain must always be wetted for cutting. with a film of lubricant. Chain type Pitch Minimum groove depth Picco 3/8" P 5.0 mm Rapid 1/4“ 4.0 mm Rapid 3/8“; 0.325“ 6.0 mm Rapid 0.404“ 7.0 mm MS 311, MS 391...

  • Page 49: Air Filter System

    Remove air filter Clean away loose dirt from around the filter Do not use tools to remove and install the air filter – the air filter could be damaged in the process. MS 311, MS 391...

  • Page 50: Adjusting The Carburetor

    Check the air filter and clean or In case of stubborn dirt: replace if necessary. Wash the filter in STIHL special- Check the spark arresting screen purpose cleaner (special (country-specific) in the muffler and accessories) or a clean, non- clean or replace if necessary.

  • Page 51: Spark Arresting Screen In Muffler

    Idle setting is too lean: Turn the low speed screw (L) counterclockwise until the engine runs and accelerates smoothly. It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L). MS 311, MS 391...

  • Page 52: Spark Plug

    Pull off the spark plug boot If the spark plug comes with a only suppressed spark plugs of the detachable adapter nut (1), screw type approved by STIHL – see Unscrew spark plug the adapter onto the thread and "Specifications".

  • Page 53: Replacing The Starter Rope And Rewind Spring

    Remove screws (1) making a special knot Push hand guard upward Pull the knot into the starter handle Pull the bottom of the fan housing away from the crankcase and remove downwards MS 311, MS 391...
  • Page 54 Hold the rope rotor tight – pull out the twisted rope and untangle it Release the rope rotor Slowly let go of rope so that it winds onto the rotor MS 311, MS 391...

  • Page 55: Storing The Machine

    (5) including needle cage (6) from the crankshaft – with STIHL recommends use of original QuickStop Super chain brake, press STIHL chain sprockets in order to throttle lock beforehand ensure optimal functioning of the chain brake. MS 311, MS 391...

  • Page 56: Maintaining And Sharpening The Saw Chain

    Maintaining and sprocket Sharpening the Saw Chain Clean crankshaft stub and needle Sawing effortlessly with a properly cage and lubricate with STIHL sharpened saw chain lubricant (special accessory) Slide needle cage onto the A properly sharpened saw chain cuts crankshaft stub...
  • Page 57 Rapid Micro X (RMX, rip- ping chain) Picco Micro X (PMX, rip- ping chain) Tooth shapes STIHL filing gauge (special accessory, Micro = semi-chisel tooth see table "Sharpening tools") – a Super = chisel tooth universal tool for checking sharpening...
  • Page 58 0.325 (8.25) 0,65 (0.026) The rest of the humped drive link (9.32) 0,65 (0.026) must not be filed; otherwise, this 0.404 (10.26) 0,80 (0.031) could increase the tendency of the chain saw to kick back. MS 311, MS 391...
  • Page 59 0814 252 3356 5605 007 1029 0.404 (10.26) 5.5 (7/32) 5605 772 5506 5605 750 4330 1106 893 4000 0814 252 3356 5605 007 1030 consisting of file holder with round file, taper square file and file gauge MS 311, MS 391...

  • Page 60: Maintenance And Care

    Check Inspect, also check sharpness Saw chain Check chain tension Sharpen Check (wear, damage) Clean and turn over Guide bar Deburr Replace Chain sprocket Check Clean Air filter Replace Check Antivibration elements Have replaced by dealer MS 311, MS 391...
  • Page 61 Replace Safety labels Replace STIHL recommends a STIHL servicing dealer. see chapter on "Chain Brake" Firmly tighten down the cylinder base screws of chain saws (3.4 kW or more) after 10 to 20 hours of operation. not in all versions, market-specific...

  • Page 62: Minimize Wear And Avoid Damage

    English servicing dealer. STIHL dealers are Minimize Wear and Avoid regularly given the opportunity to attend Damage training courses and are supplied with the necessary technical information. Observing the instructions in this manual helps reduce the risk of unnecessary If these maintenance operations are not wear and damage to the power tool.

  • Page 63: Main Parts

    16 Front hand guard 17 Front handle (handlebar) 18 Starter grip 19 Fuel tank twist lock 20 Master Control lever 21 Throttle trigger 22 Throttle trigger interlock 23 Rear handle 24 Rear hand guard Serial number MS 311, MS 391...

  • Page 64: Specifications

    Sound and vibration levels Engine Fuel tank capacity: 0.60 l The idle, full-throttle and nominal STIHL single cylinder two-stroke engine Chain lubrication maximum speed are given equal MS 311 consideration when calculating sound and vibration levels. Fully automatic, speed-controlled oil Displacement: 59.0 cm...

  • Page 65: Special Accessories

    English REACH – STIHL lubricating grease Special Accessories – STIHL filler nozzle for fuel – helps avoid spills and overfilling during REACH is an EC regulation and stands refueling for the Registration, Evaluation, Chain scabbard Authorisation and Restriction of –...

  • Page 66: Ordering Spare Parts

    Serial number MS 391: 64.1 cm approved by STIHL for this power tool or are technically identical. Only use high- conforms to the specifications of quality replacement parts in order to Guide bar part number...

  • Page 67: Quality Certification

    All STIHL products comply with the highest quality standards. An independent organization has Elsner certified that all products manufactured by STIHL meet the strict requirements of Head of Product Group Management the ISO 9001 standard for quality management systems in terms of product development, materials purchasing, production, assembly, documentation and customer service.
  • Page 68 0458-542-0121-B englisch *04585420121B* www.stihl.com 0458-542-0121-B...

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